bennett



2 Sheets-Sheet 1.,

(No Model.)

W. E. BENNETT. STITCH FORMING MECHANISM FOR BUTTON SEWING MAGHINB$.

Patented Oct. '30, 1888.

Wihesses;

[n we n Z01;

'%/ZM @W wwwm (No Model.) 2 Sheets-Sheet 2.

W. E. BENNETT.

STITCH FORMING MECHANISM FOR BUTTON SEWING MACHINES.

Patented Oct. 30, 1888.

. during the formation of my stitch.

ra'rns T FFJI WALTER E. BENNETT, OF BOSTON, MASSACHUSETTS, ASSIGN OR TO THE MORLEY BUTTON SEWING MACHINE COMPANY, OF SAME PLACE.

STITCH-FORMING MECHANISM FOR BUTTON-SEWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 392,096, dated October 30, 1888.

Application filed March 20, 1888.

To all whom it may concern:

Be it known that I, WALTER E. BENNETT, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massa chnsetts, have invented certain new and Improved Stitch-Forming Mechanism for Shank- Button Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the construction and operation of the same, reference being made to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in certain mechanism designed to operate in the fabric-supporting arm of the machine for which Letters Patent were granted to Rosewell Thompson November 30, 1886, N 0. 353,609, by which means I may, in combination with the needle, threadcontrolling device,and other operating mechanism so manipulate the thread as to form the stitch for which Letters Patent were granted tome July 26, 1887, No. 367,334, the specification and drawings of said machine and stitch being referred to in connection with the accompanying description and illustrations of my present invention.

In the accompanying drawings, Figures 1, 2, 3, 4, 5, and 6 are longitudinal sectional views of the front end of the fabric supporting arm of the machine referred to, showing my improved oscillating double hook and thread guard in some of the positions they occupy The needle, needle-bar, and lower end of needle-bar bearings of said machine are also shown in various working positions. The presser-foot, pivoted needlebarb cover, takeup, fabric feeding, and locking loop-spreading mechanf ism of the machine are not shown,as they form no part of my invention, and the movements of the same are not changed by the operation of my devices. Fig. 7 is an enlarged View of the working end of the needle, showing the form of the eye and barbs, the shallow grooves above and below the eye, and the flattened beveled portion above the eye. Said grooves and beveled portion are the same upon both sides of the needle. Fig. 8 is also an enlarged View of the needle, but showing the same in crosssection on line a: 0:,looking toward the eye and point, the form being nearly triangular at this place, the sharp edge being upon the back of the needle and at a right angle to the grooves and eye of the same. Fig. 9 is a detached top view of the oscillating double hook, showing the opening in the center for the needle, the form of the points which pass the beveled portion of the needle under the thread, the thin springs upon the sides which retain the loop of thread for a time near the points of the hook, the positions of the lever and bar which impart motions to the hook,the needle-pointsupporting extension below the points of the hook with its opening in the center for the needle, and the conical-pointed bearings which pass through the stationary lugs of the bracket and enter the hub of the oscillating hook. Fig. 10 is adetached top view of the threadguard, thread-controlling device, and an oblique view of the needle, showing the relative positions of these devices when forming the part of the stitch shown in Fig. 5. Fig. 11 is an enlarged perspective view of the oscillating double hook and devices connected therewith, and also theneedle, button, fabric, thread, and threadguard, showing said needle in its lowest position and its point supported by the extended needle-support while the two points of the hook are about to pass the beveled portion of the needle, said support insuring the perfectly steady and central position of the needle while said points are passing between the needle and loop of thread upon the sides of the same. perspective view of the same devices, but with the thread-guard moved forward and the first or primary loop of thread removed. from the eye of the needle and pulled back by the points and springs of the double hook, andthe needle rising with the secondary loop of thread in the eye of the same and drawing it through the pulled-back primary loop. Fig. 13 is an enlarged top view of the oscillating double hook, showing the form of the points and springs upon the sides of the same. In this View the primary loop of thread is represented as slipping off the points of the hook and from under the bent portion of the side springs Fig. 12 is also an enlarged during the backward motion of said double hook after the secondary loop of thread is partially pulled through it.

Similar letters of reference indicate corresponding parts.

A is the longitudinal section of the front end of the fabric-supporting arm of the machine.

B is the lower or jointed end of the oscillating needle-bar bearing. 0 is the support for the latter. D is the pivot upon which said bearing turns.

E is the needle-bar.

F is the needle.

G is the stationary bracket for the bearings or pivots of the oscillating double hook.

H is a longitudinal section of the cover-plate of the arm, which, in consequence of the narrow slot through which the needle and thread pass, also forms the throat-plate of the machine.

a is the oscillating double hook, the top edges of which are segmental in form and concentric with the center of motion.

1) is a needle-point support extending from the body of the hook between the hook-points and the hub, andis also segmental in form and concentric with the center of motion.

0 is the hub of the hook.

d is a lever which extends from the end of the hub at an angle of about forty-five degrees with relation to the body of the book. a is the bar which connects said lever with the cam in the body of the machine, which imparts the proper motions to the hook.

ff are thin flat springs secured to the sides of the hook, the top edges of which are nearly parallel with the top edges of said hook; but the extreme ends are bent in such a form as to retain for a time the loop of thread which the points of the hook have taken from the eye of the needle during their forward movement.

9 g are the adjustable conical-pointed bearings, which pass through the lugs of the bracket and enter the ends of the hub of the hook.

it is the thread-guard.

t" is the bar which connects the guard with the cam in the body of the machine, which imparts the proper motions to said thread-guard.

j is the thread-controlling device.

It' is the rod which connects the thread-controlling device with the cam in the body of the machine, which imparts the proper motions to the same.

Zrepresents a section of fabric to which a button is secured by my stitch. in represents a shank-button, and n the thread in its various forms and positions during the formation of the stitch.

The needle I use in connection with my oscillating double hook is straight and has a round point and an open eye with two barbs, as shown in Fig. 7, the lower barb serving to retain the thread in the eye when the primary and secondary loops are pulled upward through and above the fabric, and the upper barb serving to retain the thread when the primary loop is forced downward through and below the fabric by the needle. the space between the two barbs being sulficient to allow the thread to pass into or out of the eye when operated upon by the thread-controlling device and double hook. The beveled portion above the eye, having the sharp edge of the back opposite said eye, is designed to insure the passing of the two points of the double hook between the needle and thread during their forward motion, said points being-a little nearer each other than the full diameter of the needle, so that they first strike the beveled portion under the thread and are sufficiently elastic to pass the full diameter of the needle during their remaining forward motion while the loop of thread is upon said points.

I will now describe the formation of my stitch with my improved mechanism, with reference to the accompanying drawings.

The thread is pulled from the take-up of the machine and passed through the two holes in the thread-controlling device, leaving about two inches of thread extending beyond the last hole, the double hook, thread-guard, and needle being at this time in the positions shown in Fig. l. The fabric being placed upon the throat-plate, with a shank-button held in its proper position by the devices on the machine for that purpose, motion is imparted to the machine. Then the needle has a downward movement, piercing the fabric outside the button eye and passing the eye of the needle below the fabric. While in this position the thread-controliing device is swung around sufficiently far to cause the thread to enter the open eye of the needle. Then the needle has an upward motion, which draws the thread through the fabric and forms a loop of some length, as shown in Fig. 1. Then the needle has another downward movement; but this time it is passed through the button-eye and forces the loop of thread through it and the fabric, carrying the loop some distance below the fabric, as shown in Fig. 2. While in this position the double hook is moved forward, so that the two points of the same may pass between the loop of thread at the beveled portion of the needle. Fig. 2 represents the points just entering the loop. The hook continues the forward motion, while the needle moves upward, as indicated by the arrows. The hook is moved forward sufliciently far to remove the loop of thread from the eye of the needle, retaining it upon the points of the hook and causing the needle to rise to its highest position with no thread in the eye of the same, as shown in Fig. 3. The needle then has another downward movement and again pierces the fabric outside the button-eye. In the meantime the double hook has a backward motion, with the loop of thread retained upon the points of the same by the pressure of the springs upon the sides, they being of such a shape as to allow the thread to pass under them during the forward motion of the hook. Said shapeisshown in Fig. 9. The hook pauses in in its backward motion in about the position shown in Fig. 4, which allows the point and eye of the needle to pass through theloop drawn back by the points and springs of the hook. The point of the needlejust entering the loop is represented in Fig. 4; While the needle is thus passing through the loop the thread-guard it has a forward movement until it is in about the position shown in Figs. 5 and 10, and when the eye of the needle is in its lowest position the thread-controlling device is again swung around as it was after the first downward movement of the needle to the position shown in Fig. 10, so that the thread may again be forced into the open eye of the needle. Then the latter has another upward movement and draws with it a second loop of thread, but first through the bent-back loop, the threadguard being in such a position at this time as to cause the needle-loop to easily enter the bent-back loop during its upward motion with the needle, as shown in Fig. 5. The needle continues its upward motion, drawing with it said second loop of thread through the fabric, as shown in Fig. 6. In the meantime the un der loop is removed from the points of the hook by the continued backward motion of the latter, as shown in Fig. 6. The thread-guard is also moved back in unison with the hook. Then when the needle, with its second loop of thread, has reached its highest position,which is about the same as in Fig. 1, the loop-spreading mechanism of the machine removes said loop from the eye of the needle and passes it over the body of the button. Then the take-up mechanism of the machine, with the aid of the tension, exerts suiiicient strain upon the second loop and all the threads to tighten them about the button-eye and fabric, thus com pleting my stitch by mechanism described and referred to.

The sides of the needlesupport b are under and extended beyond the points of the double hook,so that when the needle is forced through the fabric with the primary loop of thread in the eye of the same, said sides may come in contact with saio needle during the forward motion of the double hook before the points of the same pass the needle. The slot or opening in said extension is the same width as the diameter of the needle and exactly under the opening between the points of the hook, so that ifthe needle when forced through the fabric should, for any reason, be sprung slightly away from its central position it will be forced back to its proper working position and retained there during the passing of the points of the hook over the beveled portion of said needle and between the loop of thread which is to be removed from the eye by said hookpoints.

The springs f f upon the sides of the oscillating double hook are bent at their extreme ends in such a form and press upon the sides of the points in such a manner that the primary loop of thread when removed from the eye of the needle by said points during their forward motion may pass under said bent portion of the springs and be retained by them upon the sides of the points back of the bent portion during a portion of the backward motion of the oscillating double hook, and while the needle is passing through said loop and drawing the secondary loop of thread partially through it. Then the backward motion of said double hook and springs being continued, the loop of thread, passing under the bent portion of the springs in the manner shown in Fig. 13, slips off from the points of the hook.

Having thus fully described the construction and operation of my improved stitchforming mechanism, I claim as new and desire to secure by Letters Patent- In a button-sewing machine, the combination, with the double-barbed needle and the co-operating stitch-forming devices, of the oscillating double hook and operating mechanism therefor, the said hook having points which pass upon either side of the needle, pressure-springs for engaging the thread-loop bearing upon the points, and the slotted extension b, to serve as a needle-support, all substantially as described,and for the purpose set forth. y

WALTER E. BENNETT.

Witnesses:

O. H. WARREN, E. P. MERwIN. 

